sys/net/if_dead.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2009 Robert N. M. Watson
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * When an interface has been detached but not yet freed, we set the various
  31  * ifnet function pointers to "ifdead" versions.  This prevents unexpected
  32  * calls from the network stack into the device driver after if_detach() has
  33  * returned.
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/socket.h>
  39
  40 #include <net/if.h>
  41 #include <net/if_var.h>
  42 #include <net/if_private.h>
  43
  44 static int
  45 ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
  46     struct route *ro)
  47 {
  48
  49         m_freem(m);
  50         return (ENXIO);
  51 }
  52
  53 static void
  54 ifdead_input(struct ifnet *ifp, struct mbuf *m)
  55 {
  56
  57         m_freem(m);
  58 }
  59
  60 static void
  61 ifdead_start(struct ifnet *ifp)
  62 {
  63
  64 }
  65
  66 static int
  67 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  68 {
  69
  70         return (ENXIO);
  71 }
  72
  73 static int
  74 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
  75     struct sockaddr *sa)
  76 {
  77
  78         *llsa = NULL;
  79         return (ENXIO);
  80 }
  81
  82 static void
  83 ifdead_qflush(struct ifnet *ifp)
  84 {
  85
  86 }
  87
  88 static int
  89 ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
  90 {
  91
  92         m_freem(m);
  93         return (ENXIO);
  94 }
  95
  96 static uint64_t
  97 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
  98 {
  99
 100         return (0);
 101 }
 102
 103 static int
 104 ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
 105     struct m_snd_tag **ppmt)
 106 {
 107         return (EOPNOTSUPP);
 108 }
 109
 110 static void
 111 ifdead_ratelimit_query(struct ifnet *ifp __unused,
 112       struct if_ratelimit_query_results *q)
 113 {
 114         /*
 115          * This guy does not support
 116          * this interface. Not sure
 117          * why we would specify a
 118          * flag on the interface
 119          * that says we do.
 120          */
 121         q->rate_table = NULL;
 122         q->flags = RT_NOSUPPORT;
 123         q->max_flows = 0;
 124         q->number_of_rates = 0;
 125 }
 126
 127 void
 128 if_dead(struct ifnet *ifp)
 129 {
 130
 131         ifp->if_output = ifdead_output;
 132         ifp->if_input = ifdead_input;
 133         ifp->if_start = ifdead_start;
 134         ifp->if_ioctl = ifdead_ioctl;
 135         ifp->if_resolvemulti = ifdead_resolvemulti;
 136         ifp->if_qflush = ifdead_qflush;
 137         ifp->if_transmit = ifdead_transmit;
 138         ifp->if_get_counter = ifdead_get_counter;
 139         ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
 140         ifp->if_ratelimit_query = ifdead_ratelimit_query;
 141 }